Calibration of tubes 



329 



635] In the following result the column whose length is given in the 2 nd 

 column is supposed to begin at \ inch from the bend. 



By the resistance of each is meant 



grains in each inch 



[The resistance of a column of mercury one inch long weighing one grain 

 is -13 Ohms, and the resistance of saturated solution of salt at t Centigrade is 

 to that of mercury as io 8 is to 2015 + 45-1 (t 18). Hence the resistance as 

 given by Cavendish must be multiplied by 6907 + 82-2 (59 T) to convert it 

 into Ohms when the tube contains saturated solution at T Fahrenheit.] 



RESULT. 



